#1 Alexis Sanchez
The Chilean forward was signed by Barcelona in 2011 and played for them till 2014. He has brilliant ball-skills and the ability to score important goals. At his best, Alexis Sanchez was one of the best forwards in the world and he won one La Liga title with Barca.
However, he had to compete with the likes of David Villa and Pedro Rodriguez for a place in the starting line up at Barca. Still, he managed to score 47 goals in 141 matches for them. Sanchez left Barca for Arsenal in 2014 and was successful for the Gunners too.
He joined United from Arsenal in 2018 but has not been able to cement his place in the starting line-up of the Red Devils. He has been sidelined by the likes of Anthony Martial, Jesse Lingard and Marcus Rashford at United, and scored only 5 goals in 41 matches for them. His future with the club is uncertain, and he might be sold off before the beginning of the next season.